/Engine/Source/Runtime/MeshConversion/Public/ToDynamicMesh.h
Populates overlays for UVs, Normal, Color, Material ID. Also Tangent and BiTangent if bCopyTangents == true. NB: This does not copy any polygroup information.
void PopulateOverlays ( FDynamicMesh3 & MeshOut, const SrcMeshType & MeshIn, [TFunctionRef](API\Runtime\Core\GenericPlatform\TFunctionRef)< int32(const [SrcTriIDType](API\Runtime\MeshConversion\TToDynamicMesh\SrcTriIDType) &SrcTrID)> MaterialIDFunction, bool bCopyTangents )